The spreval package contains a number of functions to
assess irrigation sprinkler system application uniformity and
efficiency. Use of the functions allow for assessment of lateral-move,
solid-set, and hose pull (big gun) irrigation systems. Assessment of
landscape sprinkler irrigation systems may also be done using functions
contained in the package. The description at the top of the package’s CRAN
page provides more detail and background.
spreval::catchcan is a data file included in this package.
Methods implemented in this package and data used in the vignettes are
taken from the references below:
Christiansen, J.D. 1942. Irrigation by Sprinkling. California Agricultural Experiment Station Bulletin 670. (https://archive.org/details/irrigationbyspri670chri/page/n3/mode/2up)
Evans, R.O., Barker J.C., Smith J.T., Sheffield R.E. 1997b. Field calibration procedures for animal wastewater application equipment, hard hose and cable tow traveler irrigation system. NC Cooperative Extension Service publication AG-553-2. Raleigh, NC. (https://content.ces.ncsu.edu/hard-hose-and-cable-tow-traveler-irrigation-systems)
Evans, R.O., Barker J.C., Smith J.T., Sheffield R.E. 1997a. Field calibration procedures for animal wastewater application equipment, stationary sprinkler irrigation system. NC Cooperative Extension Service publication AG 553-1. Raleigh, NC. (https://irrigation.wordpress.ncsu.edu/files/2017/01/ag-553-1-stationary-sprinkler.pdf)
Mirriam and Keller, 1978. Farm System Irrigation Evaluation: A Guide for Management. Form II-1, item 10, p.29. Utah State University, Logan, Utah. (https://pdf.usaid.gov/pdf_docs/PNAAG745.pdf)
You can install the released version of spreval (release data 2021-07-08) from CRAN with:
install.packages("spreval")or you may access from the “Links” listing on this page, or navigate to the github repository page and click under “releases” to download the source code and install locally.
A pdf file documenting all of the package functions is available at: here
Check the changelog tab for updates on version history.
A quick example of a couple of things this package will do is shown
below. In this example, conventional statistics, e.g., CU,
DU, DU low half (DU.lh), and PELQ
are computed. Additionally, a cumulative distribution plot of the data
are shown with a target depth (sfplot) to help visualize
the relative area receiving less than or more than the target depth, and
the deviation from the target depth is shown. For perspective, the top
of the plot can be considered as the soil surface and the cumulative
distribution line the depth of catch:
library(spreval)
## basic example code
data("catchcan")
cc.data<-catchcan$solid.set #fetch solid set data
ss.uni<-c(CU(cc.data),DU(cc.data),DU.lh(cc.data),PELQ(cc.data,SI=FALSE,rate=16.98,ss=80,sl=80,dur=2.25))# use U.S. cust. units
table<-round(ss.uni,0)
knitr::kable(t(table),col.names=c("CU","DU","DU.lh","PELQ"))#transpose array (table) for display| CU | DU | DU.lh | PELQ |
|---|---|---|---|
| 75 | 55 | 76 | 55 |
sfplot(as.vector(cc.data),target=0.57,ylab="depth caught, in.")